21287505

素因数分解:

$3^1\times 5^1\times {\mathrm{19}}^1\times {\mathrm{113}}^1\times {\mathrm{661}}^1$

素因数の和:801

約数の個数: 32

約数和(自身を含む): 36224640

約数和(自身を除く): 14937135

約数列:

[1, 3, 5, 15, 19, 57, 95, 113, 285, 339, 565, 661, 1695, 1983, 2147, 3305, 6441, 9915, 10735, 12559, 32205, 37677, 62795, 74693, 188385, 224079, 373465, 1120395, 1419167, 4257501, 7095835, 21287505]

約数ペア:

[(1, 21287505), (3, 7095835), (5, 4257501), (15, 1419167), (19, 1120395), (57, 373465), (95, 224079), (113, 188385), (285, 74693), (339, 62795), (565, 37677), (661, 32205), (1695, 12559), (1983, 10735), (2147, 9915), (3305, 6441)]